search for: exclosure

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2006 Mar 24
0
Random covariate in survreg (Survival)
Dear R Listers- I am attempting to analyse the survival of seeds in cages (exclosures) that differ in their permeability to rainforest mammals. Because I did not observe the moment of seed disappearance, my data is interval censored. This limits my options for analysis (as I understand it) to survreg, in the survival package. Because I repeated the experiment in 8 sites, I...
2009 Dec 01
0
GLM Repeated measures test of assumptions: e.g. test for sphericity e.g. Bartletts and Levenes homogenous variances
...Biomass~(Treatment+Time+Site)^2, data=bobB, family=quasi(link="log", variance="mu")) par(mfrow=c(2,2)) plot(model2) to test the effect of grazing exclusion of feral horses for a Phd with following factors: Treatment - 3 levels which are grazed controls (C), ungrazed horse exclosures (H)with 3 wire strand fence to allow other herbivores but not horses and ungrazed full netting exclosures to exclude all herbivores (A) Site - 6 levels for 6 Sites which are considered fixed Time - 6 levels also for 6 different monitoring or time periods which is where the repeated measures com...
2009 Dec 01
0
Amendment to previous post a minute ago, please amend before posting if possible
...Biomass~(Treatment+Time+Site)^2, data=bobB, family=quasi(link="log", variance="mu")) par(mfrow=c(2,2)) plot(model2) to test the effect of grazing exclusion of feral horses for a Phd with following factors: Treatment - 3 levels which are grazed controls (C), ungrazed horse exclosures (H)with 3 wire strand fence to allow other herbivores but not horses and ungrazed full netting exclosures to exclude all herbivores (A) Site - 6 levels for 6 Sites which are considered fixed Time - 6 levels also for 6 different monitoring or time periods which is where the repeated measures com...
2010 Jan 11
0
tweedie.profile error message
...zing exclusion experiment to test effects of feral horse grazing on a number of variables whereby C=controls so open to all herbivores, HE= Horses excluded but allowing other herbivores such as macropods, rabbits, and AHE= is a fully enclosed high wire fence excluding all herbivores. One treatment exclosure type was erected at each site but within these 30m2 exclosures there were two randomly located 5x6m plots so that is why there are two treatment replicates at each site even though there was only one exclosure at each site. I have analysed biomass for example already using ##this is the genera...